Fuel gauge pegged
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1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Fuel gauge pegged in Past Cadillac Vehicle Discussion; Current code; P0463- Fuel Sensor Circuit High Input. Just started this last night. can this be anything other than replacing ...
  1. #1
    Cadygrl's Avatar
    Cadygrl is offline Cadillac Owners Member
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    Fuel gauge pegged

    Current code; P0463- Fuel Sensor Circuit High Input.

    Just started this last night.

    can this be anything other than replacing fuel gauge sensor?

    Thanks for input....

    Ken

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Fuel gauge pegged

    I'd put my money on the level sensor.

  4. #3
    carnut is offline Cadillac Owners Master
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    Re: Fuel gauge pegged

    I'd put my money on a disconnected wire to the sender. Normally when a GM car has an open connection to the tank sender, the gauge pegs to full.

  5. #4
    Caddy-EaRL's Avatar
    Caddy-EaRL is offline Cadillac Owners Fanatic
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    Quote Originally Posted by carnut
    I'd put my money on a disconnected wire to the sender. Normally when a GM car has an open connection to the tank sender, the gauge pegs to full.
    Slim chance wire has disconnected. Them suckers are hard to get off even when you're trying lol

  6. #5
    carnut is offline Cadillac Owners Master
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    Re: Fuel gauge pegged

    I don't mean unplugged, I mean cut, broken somewhere from the dash gauge to the sender.

  7. #6
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    It's most likely just the sender. Fairly common failure.

  8. #7
    Cadygrl's Avatar
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    Re: Fuel gauge pegged

    Hi Guys; I'm trying to put up a picture, but for some reason I can't make it happen. I picked up a new fuel level sensor and have the fuel lines and plugs disconnected. I have the ring off, but I can't get the assembly out of the tank. Its a hair to big to fit through the hole. Is there something I'm missing?

    Thanks....

    Ken

  9. #8
    Cadygrl's Avatar
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    Re: Fuel gauge pegged

    I've been struggling with this for a couple of hours. A couple of pointers would be great.

    Thanks....

    Ken

  10. #9
    scanssystems's Avatar
    scanssystems is offline Cadillac Owners Enthusiast
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    You just have to play with it. 3 minute task. It is hard to put it back too. Just make it happened. No tweeks here.

  11. #10
    Caddy-EaRL's Avatar
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    Quote Originally Posted by Cadygrl
    I've been struggling with this for a couple of hours. A couple of pointers would be great.

    Thanks....

    Ken
    I just changed mine is morning. It's typical for the plastic to get malformed a bit over the years being submerged in gas. What I do is pull it up and out a bit one side, then take a small pocket screwdriver and work the other side out by prying on it between the pump and tank neck. Putting it back in wont be difficult at all, it will drop right down.

  12. #11
    Cadygrl's Avatar
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    Re: Fuel gauge pegged

    Thanks for the tips. I finally got it. I was afraid I was going to break it. Got it out, cleaned it, put the new sensor in it and stuffed it back in. You were right Earl, it fell right in. Works perfect.

    Thanks...

    Ken

  13. #12
    littlewolf is offline Cadillac Owners Member
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    Re: Fuel gauge pegged

    I may need to change my sensor as well on my 2003 deville. I have no code but my gauge acts erratically after about 9.3 gallons used.Do i need to relieve the fuel pressure in the lines or is removing the filler cap enough for this job.

  14. #13
    Ranger's Avatar
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    Re: Fuel gauge pegged

    You need to relieve the line pressure.

  15. #14
    littlewolf is offline Cadillac Owners Member
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    Re: Fuel gauge pegged

    Thanks. I guess I'll have to get a fuel pressure gauge with a bleeder valve.

  16. #15
    Ranger's Avatar
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    Re: Fuel gauge pegged

    No, all you need to do is wrap a towel around the service port to absorb the oz. of gas that will come out and press the schreader valve (just like letting the air out of your neighbors tire). Simple as that and the system is depressurized.

    Or, pull the fuel pump fuse and crank the engine.

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